Valve cap



y 1940- L. c. BROECKER 2,202,185

VALVE CAP Filed June 10, 1938' 112- TiE- INVENTOR.

BY W W I V ATTORNEYS Patented May 28, 1949 OFFICE vALvi: CAP

Application June 10, 1938, Serial No. 212,961

2 Claims.

This invention relates to valve caps and more pin of the valve core. Theprovision of the coniespecially to valve caps for use on the stems oftires for high-speed motor buses and trucks. Due to the hightemperatures encountered in the tires of high-speed motor buses andtrucks, the conventional valve caps and rubber seal are provingunsatisfactory due to deterioration of the rubber as a result of thehigh temperatures.

An object of this invention is to provide a valve cap for such tireshaving a soft metal seal that will not be afiec ted by the heatencountered in such tires.

In order to seal properly and retain its sealing qualities for a longperiod of time, the tire valve cap of this invention is so designed thatthe relatively soft sealing member can swivel with respect to the bodyof the cap. Also, the design is such that when the cap is applied to avalve stem, the sealing member is pressed against the endof the valvestem substantially in a straight line and with little, if any, tendencyto rotate with respect to the stem.

Other objects, novel features and advantages of this inventionwillbecome apparent from the following specification and accompanyingdrawing, wherein:

Fig, 1 is a sectional view of a cap embodying In the drawing, it is avalve stem of standard construction and H is the body of the valve capwhich is suitably recessed and provided with internal threads 52 of asize suitable to be screwed 35 on to the valve stem l0.

The threads i2 terminate short of the bottom of the recess and in therecess is arranged a seal holder 13 having threads i l by which it maybe screwed into'and through the threads E2 in the 40 position shown. Theseal holder 13 is provided with a conical end 25 which contacts with thebottom of the recess in the body ii. Since the overall diameter of theunthreadecl portion of the recess is slightly larger than the overalldi- 45 ameter of the threads 54, the holder i3 is free to swivel withrespect to the body I i. In a groove in the holder 13 is provided asealing ring or washer 18 of a soft metal such as lead, tin or copper.The cap body 2 i is preferably made hex- 50 agonal or octagonal topermit the use of a small wrench or pliers for screwing it on and offfrom the stem Ii]. The holder i3 is provided with a bore I! whichprovides clearance for the center cal end l5 for the seal holder I3permits the valve body I l to turn on it with minor resistance while theWasher I 5 is being pressedagainstthe end 7 of the valve stem it! whenthe cap is screwed on 5 to the stem, thus causing substantiallyrectilinear movement of the holder into. sealing position.

Also, this same arrangement permits slight pivotal movement of theholder relative to the cap to facilitate movement of the holder intosealing 10 relation to the same.

It is of course understood that various modifications may be made in theabove described cap structure without in anyway departing from thespirit of the invention as defined in the appended 15 claims.

I claim: I

l. A valve cap comprising a fixed-size body portion having a taperedbottom recess threaded over a portion of its length for attachment to astem, 20 the remainder of said recess being of larger diameter than saidthreaded portion, a holder in said larger diameter portion exteriorlythreaded to screw through said threaded portion and having an annulargroove in its side wall adjacent 25 the exterior threads, and a softmetal ring supported by said holder in said annular groove forengagement with the end of said stem, said holder being of lesscross-section than the larger diameter portion of said recess and havinga conical portion, the tip of which contacts the tapered bottom of saidrecess to mount said holder for rocking movement. I v 2. A valve capcomprising a fixed-size body portion having a recess threaded over aportion of its length for attachment to a valve stem, the remainder ofsaid recess above the threaded portion being of larger diameter thansaid threaded portion, and the bottom of said recess being concave, aholder in said larger diametered portion of said 40 recess, said holderbeing so admeasured and exteriorly threaded in a portion thereof toscrew throughsaid threaded portion of said body portion and having anannular groove extending longitudinally in its side wall adjacent saidexteriorly threaded portion, and a soft metal sealing ring supported bysaid holder in said groove for engagement with the end of the stem, saidholder having a conical portion, the tip of which contacts the concavebottom of said recess to mount said holder for rocking movement.

LEWIS C. BROECKER.

